The performance of a magnet is quantitatively described by its key magnetic parameters, which are usually presented on a demagnetization curve. The three most critical parameters are Remanence (Br), Coercivity (Hc), and Maximum Energy Product (BH)max . Remanence (Br), measured in Tesla (T), indicates the magnetic flux density a magnet can retain after being magnetized in a closed circuit. Coercivity (Hc), measured in kA/m, reflects the magnet's resistance to demagnetization by an external reverse magnetic field . The Maximum Energy Product (BH)max, measured in kJ/m³, represents the peak energy density of the magnet and is a key indicator of its overall strength; a higher value means a stronger magnet . Other important parameters include the Curie Temperature (Tc), which is the temperature at which the material loses its magnetism entirely. It's important to note that the maximum operating temperature is considerably lower than the Curie temperature. For instance, while NdFeB's Curie point is around 350-370°C, its practical upper working limit is often only 180-200°C .